Viking compact entry phoneWeather and vandal resistantTelephone line poweredCompact size allows it to be mounted in single gang electrical boxMylar speaker, faceplate gasket, mic and speaker gasket, internally sealed push button switch, self-draining mic mount and UV stable weather resistant powder coatingStainless steel push button, stainless steel speaker screen, scratch resistant powder coating, hex drive mounting screwsMicrophone and speaker volume controlsProgrammable intelligent call progress detection for automatic hang-up on CPC, silence, busy signal, or time outSelectable auto answer feature for monitoringProgrammable VOX (mic/speaker) switching speedVKE40WH